Rotary grizzly



Dec." 23, '1930. A. J. MYERS ROTARY GRIZZLY Filed July s, 1925 2 Sheets-Sheet 1 ATTORNEYS.

Dec. 23, 1930. A. J. MYERS ROTARY GRIZZLY Filed July 3, 1925 2 Sheets-Sheet 2 IN V EN TOR.

A TTORNEYS.

Patented Dec. 23, 1930 STATES PATENT orrics ALBERT J. MYERS, OI PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO THE KOIPLE'ERS COMEANY, F PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA ROTARY GRIZZLY 7 Application filed July 3, 1925. Serial No. 41,420.

' This invention comprehends improvements of general utility in the art of screening coke and in its more particular aspects relates to a special arrangement of the driving mechanism with respect to the operating shafts of the so-called grizzly so as to permit ready removal of any shaft of the grizzly for repairs without disturbing the driving mechanism or the removal of parts of the driving mechanism without disturbing the grizzly while maintaining at all times an efficient lubrication of the driving mechanism and protecting it from the coke dust.

In the preparation of coke for the market it is essential toscreen out the finer particles therefrom and this can be mostefilciently and quickly achieved by the use of the so-called grizzly comprising an inclined frame-work carrying a plurality; of parallel shafts on which are non-rotatablymounted hard cast iron discs, the peripheries of the discs of one shaft inter-meshing with those on the next adjacent shafts leaving restricted spaces at the ends of the peripheries for, the sifting out of the finer particles of coke. The motion of thecoke is substantially forward and downward, there being an undulating or cascade movement imparted, thereto by the periphcries of the discs and the stream of coke is 0 ordinarily attenuated'towards the lower end by increasing the speeds of the successive shafts from top to bottom. Such a construction hashi-gher capacity, than any other 7 known type of screen and is-in fact the most may be efficiently-screened. However, the

larger particles of the material to be screened out frequently catch and stick in the open spaces between the inter-meshing discs and due to their very hard characterrelatively V much harder than is possible to make the cast iron discs-cause abrasion and wear of the ilatter resulting in a materialenlarging of the screening spaces and a substantial variav tion in the degree of uniformity of grading of the material unless corrected. Thewearingj'action is greatest at the top and decreases towards the bottom due to the fact that'the 1 major portion of the screening operation is accomplished in theupper regions. hen the practical way'in which large sizes of coke upper discs become sufficiently Worn to materially affect the standard of the screening correction is in general made either by shiftmg the shafts and their attached discs from L the shaft or shafts removed from the rest of the driving mechanism even though the driving connections between the several shafts were in good order and well lubricated. The disturbance of these connections made it necessary to re-lubricate the driving mecha- 'nism when again set up and-rendered it liable I tothe introduction of destructive coke dust.

It also made it necessary to tear down the oil casing every time a shaft was removed, all

of which resulted in inefficiency and loss since it is necessary to make repairs as quickly as possible in order to cut down the shut down period of the plant. a

' My invention contemplates, broadly, ex-

pedients for overcoming all of these difficulties. This'I accomplish by removing the driving mechanism from its position ad acent the bearings of the shafts and mount- 7 ing it in an individual casing spaced apart from the ends of said shafts. The driving mechanism may conveniently consist ofa plurality of counter-shafts connected to each other within said casing by appropriate gears, or chains and sprockets, or other connecting mechanism, the counter-shafts being connected to the main shafts with which they are respectively in alignment by appropriate coupling members which permit ready uncoupling of the main shaft from the countershaft when itis desired to remove the former for replacement or repairs. A 1 further feai tureof my invention conslsts in providing an I bil'tight casing for the driving mechanism separatefromthe main frame of the grizzly and preferably provided on its bot-j tom with a plurality of baffles or dams forming pocketsfor the retention of oil into which the driving connections between the several 7 counter-shafts may dip and thus effect the or doors to permit inspection.

necessary lubrication of the driving mechanism. [If desired, similar baffles may be placed 111 said casmg above the driving mechanism inthe path of oil thrown off by centrifugal force to facilitate equalization in distribution of oilthroughout the casing. ,When the counter-shafts are connected by gears and idlers, the direction of rotation of the idlers is such as to pump oil out of the pockets, over thegdams, and to the bottom of the casing. I therefore preferably provide the casing with means for pumping ithe oil from the lower end thereof to the 'upp'er end to maintain throughout the casing. The top of thecas its circulation ing may be provided withreinovable covers In addition to the general features objects of the invention above recited, the in- V vention has such other improvements or advantages in construction and operation as are found to obtainin the structure and devices hereinafter described or claimed.

In the accompanying drawings, forming a part "of this specification, and showing for purposes of exemplification a preferred form and mannerin which the invention may be embodied or practiced, but without limiting the claimed i'nvention specifically to such lllustrative instance or instances:

Figure l is'a top plan view of a grizzly embodying the features of ,my invention, taken from theline 11' of Fig. 2, with a portion of the driving casing; removed and showing the grizzly discs partly broken ys Fig. 2 is; an end view partly in section, on the line 2 -2, Fig. 1, showing the casing for the driving mechanism and itssupports,

Fig, 3' is; ajdetail perspective View of the preferred form of coupling employed me,-

showing-the parts separated,

Fig, 4 is a similarview showing the parts assembled,

Fig. 5-is a .planview of inodified'forin ofamy invention with the top of the driving I Referring to Fig 1; there shown avv grizzlvtilprovided with supporting. frames 2 adapted to support the-same at an inclination as shown in Fig. 2. -Within these frames are journaled apluralityof parallel shafts 3'on which are non rotatablymounted a se ries of discs 4, the peripheries of'the' discs of each shaft being inter-leaved with those of the ad'acent shafts free 5021068 existin at the'ends of the discs of appropriate size for the passage'of thefiner particles of coke which it is desired to separate from the main bodythereof. These shafts 3 are journaled at their opposite ends in bearings having their upper parts 5 removable to. permit removal oftheshafts together with the discs thereon for repair or replacement. Located Just lnside of the hearings on each sidearecoke guide-plates 6 for confining the coke laterally. The shafts, as has heretofore been the custom, are driven from a common source ofv power-through inter-connected gears besprockets. f In accordance wit'h priorprac-g tice, the driving gears or sprockets were per man'ently directly connected to the ends of the shafts, necessitating, as hereinbefore noted, the dismembering of the driving mechanism when it was desired to change or repair a set of discs. I, however, construct. each shaft'an'd its discs as a unit removable independently of the driving mechanism without the necessity of disturbing the latter. To accomplish this result I connect each shaft through a separable coupling 7 with a corresponding counter-shaft 8 and mount all of said counter-shafts. in separate casing distinctand apart from the bearing. supports for the corresponding main shafts, oneof the counter-shafts 9 being connected tolthe i sourceof power and all of the counter-shafts being supported inseparable bearings 10 in the casing 11.. These counter-shafts may be inter-connected respectively by sets of drivi ing gears 13 and driven gears 13 inter-con- V nected by idlers lt. The separable coupling 7, in order to satisfy the special conditions met within con- 1 tweenthe several shafts, or by chains and 1 struotionsiof this character, preferably con- I a main shaft'and its bodyp0rtion-19 is provided, diametrically across its face with a channel 20 and 'in'contact with th'e'body 19 is adapted to restafloating intermediate part Qlprovided with a'tongue22 diametrically across its face adapted to seat in the channel 20 and onthe opposite'face of the member 21' ,71S provided diametrically a second, tongue.

23'pre-ferably at right angles to the first adapte-clto seat in the corresponding channel key-Way 27. If desired, the floating member QI-may be made integral, say, with the body sists of three parts15, 1.6 and 17, The parti i 15 is'connected byits collar 18 to the end of '26 in the face of thebody member 25' of the third coupling member 1-7,.the latter being;- provided with a collar 2 by whichit is non i rotatably, secured to a counter-shaftbythe a 1 "member', one removable tongue and chanvenient removal of a shaft. Moreover, the

floating member, when employed, additionally effects an efficient drive even though the .shaft'andits counter-shaft be not in exact alignment. V I,

The casing of the drivlng mechanism, as a further feature of my invent1on,1s preferably made oil and dust tightand is divided into 1 a lower part and an upper removable part Sl'connected by bolts 33 and provided with oil tight hinged covers 34 to permit inspection. T he bottom of the lower casing section .is provided, intermediate the idler gears 14, with upstanding baiiies or dams 35 adapted v with the bottom to form pockets into which the oil may settle and into which theidlers dip. Further baflies 36 are provided in the upper casing section intermediate the driving and driven gears 18 and 18, and since the idlers 1 1, asshown in Fig. 2, normally rotate in a counter-clockwise direction and thereby tend to pump oil out of the pockets,

causing it to descend to-the bottom of the cas- A 7 ing, I preferably employ an oil return pipe 27 connected to the bottom of the casing through which the oil is pumped by a pump 38 and a pipe 39 into the upper end of the casing thereby maintaining continuous the V flow of oil therethrough.

In Figs. 5, 6 and 7, is shown a modified form of drive, consisting of driving sprockets and driven sprockets'51 on the counter-shafts connected respectively in pairs by chains 52,the consecutive. chain drives being connected in offset staggered or overlapping relation as shown in Fig. 6. I provide an oil pocket for each chain drive in corresponding overlapping relationship by extending from the bottom of the casing walls or dams 53, and since in a-chain drive,

, the chain passes through the oil in a reverse direction to the motion of the idlers in Fig.

2 or clockwise they tend to carry the oil up the incline and maintain the several pockets filled therewith, thus obviating the necessity of using an oil pump and return pipes from the bottom to the top of the oil casing although the latter may,'of course, be employed if desired. v Y

In theioperation of the device, when it is desired to remove a main shaft for replacement or repair of the discs therein, the hear ing caps 5 are removed which permits the shaft to belifted, thecoupling 7 being rotated until one of the tongue and channel pairs assumes a substantially vertical position when t is readily separated without interference in any manner with the driving mechanism. The latter mechanism and its casing comprise a self-contained unit in rotation of the idlers 14 or the chains 52 in their respective oil pockets efiects a continuous feed of the oil to the driving mechanism maintaining a uniform lubrication of the latter. The uniformity of lubrication in the case of the idlers may be further enhanced by the use of the oil pump 38 and the return oil flow pipes 37 and 39 leading from the bottom of the case to the top thereof, and by the further use of baliles 36 between the gearing on the counter-shafts. Should itbe necessary to repair the driving mechanism this also may readily be accomplished without disturbing the grizzly mechanism.

The features of the inclined series of oil holding compartments form the subject matter of my co-pending divisional application Serial No. 496,389, filed November 18, 1930,

"1. In a rotary grizzly structure, the combination with an inclined series of rotary screening roller shafts mounted for removal from the series independently of each other and respectively having rotary screening rollers fixed thereon for rotation therewith of an inclined series of counter-shafts, driving mechanism for said shafts separate from and independent of said rotary screening roller shafts, and separable connections between said counter-shafts and said rotary screening roller shafts; whereby the rotary screening rollers may be removed from and shifted to different locations in the grizzly structure by shifting of their respective rotary screening roller shafts without dismantling of the driving mechanism or altering the rate of rotation of the rotary screening rollers intended in the location in the said series to which they are shifted.

2. In a rotary grizzly structure, the combination with an inclined series of rotary screening roller shafts mounted for removal from the series independently of each other and respectively having rotary screening rollers fixed thereon for rotation therewith of an inclined series of counter-shafts, driving mechanism for said shafts separate from and independent of said rotary screening roller shafts, separable connections between said counter-shafts and said rotary screening roller shafts,and a dust-proof casing enclos ing the, driving mechanisniand located be yond the separable connections; whereby the rotary screening rollers may be removed from and shifted to different locations in the. r, grizzly structure by shifting of their respective rotary screening roller shafts Without dismantling of the driving mechanism or altering the rate of rotation of the rotary screening rollers intended in the location in 16 the said series to which they are shifted. 3. In a rotary grizzly structure, the combination with an inclined series of rotary screening roller shafts mounted for removal fromthe series independently of each other and respectively having rotary screening" rollers fiXed thereon for rotation therewith of an inclined series of co-unter-shafts5 driving mechanism for said shafts separate from and independent of said rotary screening 29 roller shafts, separable connections between said counter-shafts and said rotaryscreening roller shafts, and ad-ust-proof lubrication casing'enclosing the driving mechanism and located beyond the separable"connections; whereby the rotary screening rollers may be removed from and shifted to different locas tions in the grizzly structure by shifting of their respective rotary screening roller shafts 'Withont dismantling of the driving mecha- 30 nism or altering the rate of rotation of the rotary screening rollers intended in the 10- cation in-the said series to Which they are shifted.

In testimony whereof, I, have hereunto set my hand. 7

I ALBERT MYERS. 

